AutoCodes – GMC – B1102 GMC

B1102 GMC Code - Battery Voltage Too Low

Quick Answer

When the ignition switch is turned to ON, the Sensing and Diagnostic Module (SDM) will perform turn-on test to diagnose critical malfunctions within SDM itself. Common causes include Faulty Sensing and Diagnostic Module (SDM), Sensing and Diagnostic Module harness is open or shorted, Sensing and Diagnostic Module circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: B1102 GMC indicates Battery Voltage Too Low.
Common causes: Common causes include Faulty Sensing and Diagnostic Module (SDM), Sensing and Diagnostic Module harness is open or shorted, Sensing and Diagnostic Module circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 1,471

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Mar 22, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1102 GMC Description

When the ignition switch is turned to ON, the Sensing and Diagnostic Module (SDM) will perform turn-on test to diagnose critical malfunctions within SDM itself.
Upon passing these test ignition and deployment loop voltages are measured to ensure that they are within their normal voltage ranges. The SDM monitors the voltages at the driver low and the passenger low to detect shorts to ground or voltage in the deploy loops.
The SDM checks the wiring connection to each inflator by letting the infinitesimal current flow through the internal circuit and verify the resistance. But if the voltage is out of range, SDM is unable to check the airbag system properly.

OBDII Code B1102 GMC - Battery Voltage Too Low - AutoCodes.com — B1102 GMC Code - Battery Voltage Too Low

What does this mean?

What are the Possible Causes of the DTC B1102 GMC?

Faulty Sensing and Diagnostic Module (SDM)
Sensing and Diagnostic Module harness is open or shorted
Sensing and Diagnostic Module circuit poor electrical connection

How to Fix the DTC B1102 GMC?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B1102 GMC code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the B1102 GMC code?

Need more information on how to fix the B1102 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1102 GMC code diagnosed by a professional: Find a repair shop in your area

Precautions for SRS “AIR BAG” and “SEAT BELT PRE-TENSIONER” Service

Never probe the electrical connectors on air bag, side air curtain modules or seat belts.
Never disassemble or tamper with safety belt buckle/retractor pretensioners, adaptive load limiting retractors, safety belt inflators, or probe the electrical connectors.
Do not use electrical test equipment to check SRS circuits unless instructed to in this Service Manual.
Before servicing the SRS, turn ignition switch OFF, disconnect both battery cables and wait at least 3 minutes. For approximately 3 minutes after the cables are removed, it is still possible for the air bag and seat belt pre-tensioner to deploy. Therefore, do not work on any SRS connectors or wires until at least 3 minutes have passed.

Failure to follow this instruction may result in the accidental deployment of these modules, which increases the risk of serious personal injury or death.

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B1102 GMC Code

1. What are common symptoms of OBDII code B1102 GMC (Battery Voltage Too Low)?

The common symptoms include dimming lights, slow cranking or difficulty starting the vehicle, and issues with electrical components not functioning properly.

2. What are the possible causes of OBDII code B1102 GMC?

The code B1102 GMC (Battery Voltage Too Low) is typically caused by a weak or failing battery, loose or corroded battery connections, a faulty alternator, or a malfunctioning voltage regulator.

3. How can I diagnose the OBDII code B1102 GMC?

Diagnosing the code B1102 GMC involves checking the battery voltage with a multimeter, inspecting the battery terminals and connections for corrosion or looseness, testing the alternator output, and checking the voltage regulator.

4. What are some repair tips for OBDII code B1102 GMC?

Repair tips for resolving the code B1102 GMC include replacing the battery if it is weak or failing, cleaning and tightening the battery connections, repairing or replacing a faulty alternator, and ensuring the voltage regulator is functioning correctly.

5. Can driving with OBDII code B1102 GMC (Battery Voltage Too Low) cause further damage to the vehicle?

Continuing to drive with the code B1102 GMC can potentially cause damage to the vehicle's electrical components, lead to a complete battery failure, or result in the vehicle stalling unexpectedly.

6. How urgent is it to address OBDII code B1102 GMC?

It is important to address the code B1102 GMC promptly to prevent potential further damage to the vehicle's electrical system and ensure the vehicle remains reliable and safe to drive.

7. Will resetting the OBDII code B1102 GMC make the issue go away?

Simply resetting the code B1102 GMC will not fix the underlying problem causing the low battery voltage. It is necessary to diagnose and repair the root cause of the issue.

8. Can extreme weather conditions contribute to triggering OBDII code B1102 GMC?

Extreme heat or cold can affect battery performance and contribute to triggering the code B1102 GMC. It is essential to ensure the battery is in good condition and properly maintained, especially in harsh weather conditions.

9. How long does it typically take to repair OBDII code B1102 GMC?

The time to repair the code B1102 GMC can vary depending on the specific cause of the low battery voltage. Simple fixes like cleaning battery terminals may take a short time, while replacing a faulty alternator can be more time-consuming.

10. Is it possible to prevent OBDII code B1102 GMC from occurring?

Regular maintenance, such as checking and maintaining the battery, ensuring proper electrical system function, and addressing any warning signs promptly, can help prevent the occurrence of the code B1102 GMC.